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<Chapter Id="runtime">
<listitem>
<para>
Sets the time zone for displaying and interpreting time
- stamps. The default is to use whatever the system environment
- specifies as the time zone. See <xref
+ stamps. The default is 'unknown', which means to use whatever
+ the system environment specifies as the time zone. See <xref
linkend="datatype-datetime"> for more information.
</para>
</listitem>